If you don't already have your own personal domain and aren't ready to buy one, then you can use one of our completely free sub-domains. A free sub-domain is formatted as yournamehere.weebly.com.
When you first Publish your site, we'll prompt you to select an address for your site. To use the free sub-domain option, click the very first option and enter the name you want. Then click Continue.
If you want to switch to a personal domain later, then you can do so via the settings tab in the editor.
Click the "Change" button on the Site Address section of that page, choose another address and then Publish the site again.